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Old 6th June 2013, 08:12 AM   #4141
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Join Date: Jun 2007
Quote:
Originally Posted by Djim View Post
One question, do you think the Re of the inductor should be added to Re (driver) or Rg (amp output resistance)?
Hi Djim,

If the inductor is considered to be part of the loudspeaker system, then the resistance should be added to Re so that the effect on system electrical impedance, phase, group delay and efficiency can be seen.

Speaker cable resistance on the other hand, should be included in Rg.

Kind regards,

David
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Old 6th June 2013, 06:57 PM   #4142
Djim is offline Djim  Netherlands
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Hi David,

Thanks for clearing up.
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Old 6th June 2013, 07:14 PM   #4143
Djim is offline Djim  Netherlands
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Quote:
Originally Posted by tb46 View Post
When I don't forget about it I add .05 Ohm for every mH to Rg, and .1 Ohm for cable resistance. I find this method useful to see what would happen if the inductance is higher at low frequencies than the standard data sheet value.
Hi Oliver,

Thanks, haven't tried that yet for an inductor. Actually, I 'm thinking of a replacement circuit (made with the wizzard perhaps) if I can find a good source that explains the effect.

Last edited by Djim; 6th June 2013 at 07:32 PM.
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Old 6th June 2013, 08:15 PM   #4144
tb46 is offline tb46  United States
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Hi Djim,

Obviously, the power penalty for using an inductor would make that the wrong method for PA anyway, but for the home I think it would be fine.

Regards,
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Old 6th June 2013, 09:15 PM   #4145
stewin is offline stewin  Kenya
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my project th118
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File Type: jpg 15 tapped horn with RCF 83 214983.jpg (28.4 KB, 409 views)
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Old 6th June 2013, 10:10 PM   #4146
Djim is offline Djim  Netherlands
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Hi Oliver,

My worry was more about the raising of the Qes.
Qes-system = {(Ri + Re) : Re} x Qes
(Ri = Resistance inductor)
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Old 6th June 2013, 10:27 PM   #4147
kees52 is offline kees52  Netherlands
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Quote:
Originally Posted by Djim View Post
Hi Oliver,

My worry was more about the raising of the Qes.
Qes-system = {(Ri + Re) : Re} x Qes
(Ri = Resistance inductor)
Hi Djim

I do make coils with trafo,s who have a big aircap, I can use 2,2 mm wire
for max 15 mH and 0,2 ohm, and even lower when I do twist more wires together to get even 0,05 like I do with weld trafos for invertors.

I have now one who I am draw now who need not a inductor or just a small one because of the infinity specs who are not perfect for tapped horn.

Nice TH18 I did see, be carefull with this wooden houses there.

regards

kees
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Old 8th June 2013, 05:32 PM   #4148
kees52 is offline kees52  Netherlands
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I have remake the tapped horn, now it can be used without coil but a small one do
give still a better sim, but like Djim told me it is not important because in low frequenties there are mountains.

Further it is most of the time better in real world. conus correction is done but not drawn same for reflectors in corners.

spec is within plus and min 3 dB without coil, S2 is bigger then the first one.

regards

kees
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Old 15th June 2013, 06:37 PM   #4149
kees52 is offline kees52  Netherlands
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Hi All

I have done a exp flare tapped horn ready for test,, it has nice delay and is 211 liters big (it is some bigger because of unused space), so smaller then a uni flare as far as I now.

The box has build up with parts in flare, I go look later to minimize that and the corners get reflectors also, without getting duct in corner smaller afcourse.

And if errors, please let me now.

regards

kees
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Old 5th February 2014, 04:28 PM   #4150
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Hey All,

I've picked up a set of 4 21SW152s for a build of Ricci's Orthon. Does anyone have the model in SolidWorks?

Thanks!
lc
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